There is definitely something wrong with matplotlib/numpy. Consider the following
from numpy import *
mydata=memmap(‘map.dat’,dtype=float64,mode=‘w+’,shape=56566500)
del mydata
I can now remove the file map.dat with (from the command line) $rm map.dat
However
If I plot mydata before the line
del mydata
I can’t get rid of the file until I exit python!!
Does matplotlib keep a reference to the data? How can I remove this reference?
Mathew
Yes, for efficiency reasons matplotlib will use a reference to original data whenever possible, rather than copying it. Also, when using the pylab/pyplot API, matplotlib figures also stay around until they are explicitly deleted. You may need an explicit call to "clf('all')" to remove the figures, and thus references to the memmap'd file.
However, my advice would be to just not use memmap. I can't imagine matplotlib performs very well if the data can't all fit in memory, so you might as well just load it all into memory anyway.
Mike
Mathew Yeates wrote:
There is definitely something wrong with matplotlib/numpy. Consider the following
>from numpy import *
>mydata=memmap('map.dat',dtype=float64,mode='w+',shape=56566500)
> del mydataI can now remove the file map.dat with (from the command line) $rm map.dat
However
If I plot mydata before the line
> del mydataI can't get rid of the file until I exit python!!
Does matplotlib keep a reference to the data? How can I remove this reference?Mathew
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Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
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